1. I agree wholeheartedly with JackOutback that Abrams didnt "have to" course correct and could've taken the steps forward where RJ had left it. Any good writer (even bad ones) can think of tons of ideas of where to take the story. If only RJ had the balls to keep Luke alive + make Rey join Kylo in the let the past die speech.
2. I don't get the issue with Rey Nobody and Broom Boy. Force powers aren't and were never isolated to bloodlines. Force sensitives have existed for thousands of years and across hundreds of species. Jedi were all various types of creatures too as we saw in the PT.
The issue for mine is Order 66. (Entwined with a concept that the "Force" has a maximum 'value' which is shared amongst all beings, and kind of incorporating Midi-Chlorians which I didn't have as much an issue with as most).
All Jedi, younglings and force-sensitive people were captured and killed. The empire proceeded to test all children, stealing the force sensitive (who were never seen again).
Prior to Order 66, almost anyone could be a Jedi (thousands sharing the force), as there had been thousands of generations of Jedi's. Many different races, planets, and families showing and developing their skills in the force (and indoctrination into the Jedi cult).
After Order 66, only a few remained - and those that did actively hid their powers to avoid detection. With so few alternatives, those remaining saw their powers increase exponentially - to the point that their bloodlines became the elite.
(Think similarly of the swordplay - Prequel's with thousands of Jedi was incredibly fast and almost a dance (seriously, watch professional fencing for comparison), but after Order 66, the OT Vader/Luke fights were slow and clumsy, even in the ST with Rey/Kylo it was still physical "Broadsword" styles rather than technique.